• Husqvarna Motorcycles Made In Sweden - About 1988 and older

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

1982 WR430 - sort out jetting

beckreit

beckreit

Husqvarna
AA Class
Trying to work out the jetting on a 1982 WR430...re-built engine, new carb...bike had an air leak at the intake boot...got that sorted. Fresh gas...plug at .18 gap...etc...Running 45 pilot, stock needle, stock slide, 480 main...1.5 turns out. Bike starts (have to kick with throttle about 1/3 open...starts in 4-6 kicks), bike idles, bike runs clean on top end...1/2 throttle up. Bike does not run clean on the low end...and the air screw seems to have no effect on the bike...turn it up of down from 1.5 screws out...really cannot see a difference until about 1/2 turn out...bike will die.

Any ideas ? Thanks for the help.
 
I prefer a gap of .024", but that is not your problem. Stock jetting was 45 pilot (ok, slightly rich), 2.0 slide (way too rich), 6DH3 needle (ok) in 4th clip (too rich), R-4 needle jet (ok, slightly rich), 440 main (lean).

The stock 2.0 slide is too rich - have it cut or get a 2.5 or 3.0. I like 3.0. Move the clip to the middle position and keep your 480 main.
 
I have 2.5 slide in the carb...the needle is a 6DH3...going to try a smaller pilot and see if it improves.
 
What clip position are you running? I agree on the smaller pilot if you are going to stick with a 2.5 slide. I have much better luck with 3.0.
 
What makes the 3.0 better ? Never tried one - always had a 2.5 for what I can see in my parts bin...I am running in the middle position on the needle.
Thanks for your insight.
 
I wouldn't say its "better." 3.0 is another step leaner, helps clean up the small throttle jetting without having to go too small on the pilot or needle jet.
 
For the record, whenever I put together a new 430, I always start 45, 3.0, R4, 6DH3-3, 480. They start and run well, then can be tuned for their individual locations and use.
 
Picklito said:
For the record, whenever I put together a new 430, I always start 45, 3.0, R4, 6DH3-3, 480. They start and run well, then can be tuned for their individual locations and use.
Click to expand...
Thanks for the info...the 3.0 slide works way better...thanks again....does the 3.0 slide work better on a 250 as well ??
 
beckreit said:
new carb...bike had an air leak at the intake boot...got that sorted. .really cannot see a difference until about 1/2 turn out...bike will die.

Any ideas ? Thanks for the help.
Click to expand...

Had the same problem on the "new" carb did you check the air jet on the air cleaner side, need a microscope to find it and a jewelers screwdriver to remove it. Check, it needs to be either completely removed or 2.0. Thats why you need to open throttle its not getting enough air in pilot.
 
I just rode my '82 430WR for the first time today. Its got the stock jetting, 45 pilot, 2.0 slide, 440 main, 6DH3 needle, except for an R-2 needle jet (2 steps richer than the stock Q-8) and it is absolutely dead on perfect. The needle is in the leanest slot though, so either an R-0 needle jet or a 2.5/3.0 slide would allow me to move the needle clip to the middle slot and be able to go either direction as the temperature changes.
 
Kartwheel68 that sounds like a great start! Do you know if your bike ever actually had a Q8 in it? Seems Husky listed Q8 in the WR specs, but I have always found an R4 in there stock (US models).

Also- the stock clip was 4th position... Imagine how rich that would have been!!
 
No, I don't think so, either. I've always been suspicious that the Q8 spec was a carry-over mistake from a road-legal european model. They are sometimes exhaust-restricted and that would explain it. I seem to always end up R2-R4.
 
I put a 38 Mikuni on my 77 250CR in place of the stock Bing. Not having any factory jetting specs for the Mikuni, I used factory jetting for the 38 Mikuni on the 78 250CR.
The bike seemed to run decent, the only change I made was a 35 pilot in place of the standard 40.
I thought the bike was safe to race, but I seized it after holding it wide open climbing a hill at the Elsinore Gran Prix.
I knew I hadn't throughly checked the jetting like I should have.
This time when I started sorting the jetting out, I ended up with a R2 needle jet instead of the Q8.
I wasn't even getting into the main jet with a Q8 or R0. I guess I know why it siezed now.
 
I have no idea what was in it stock. This was a one owner but I bought it at a dealership where it was on consignment so I didnt get to talk to the owner. The only source I have for the Q-8 spec is the Husky spec sheet. I think it is likely that is wrong, I cant imagine it would run without seizing with a Q-8 in it. I think I will leave the R-2 needle jet and try a 2.5 or 3.0 slide first.
 
It seems the 3.0 is what most guys are using for the 390 and 430. I just bought a 3.0 from Amazon they had 2 left and only one now. Mikuni #VM38/52-3.0 $31.63 free shipping (left side idle screw).

The cutaway will have its largest effect coming off idle. As a side effect, at idle the 3.0 slide doesn't lean out the idle mixture. It causes a higher air speed velocity (more pressure drop), which draws more fuel from the pilot jet.

For the needle jet, I always (well not always, see below) run mine without the main jet to check the needle jet. Put the clip on the top notch (full lean) and mark your throttle 1/4, 1/2 and 3/4 with a piece of tape. It should start and run decent up to about 3/4 throttle and then start to blubber.

If it keeps reving out past 3/4 throttle the needle jet is to small and you will need the next larger size. Don't forget to put the clip back in the middle position and fine tune from there.

Knowing better, I didn't check my needle jet on my 250. I thought the 78 250 Mikuni jetting specs would be safe and I would be able to feel it, if it was to lean. It cost me a bore and a new piston with less than 5 hrs on it. So much for my "seat of the pants" tuning technique.
 
Yep, like I said the clip is in the leanest slot right now and its dead perfect, but I want to get it in the middle so I can go either direction if I need to. It is cool now and when the weather warms up it will be too rich in the middle for sure as it is set up now. I have a 2.5 slide in a 38mm on my Maico 440, I'll swap that out and see if it gets me where I want, before changing the needle jet to an R-0. I'm also temped to go to a 40 pilot, it idles perfectly and starts easily with the 45 but the mixture screw is a little more than 2 turns out, and the idle set screw is almost all the way in. It really needs a smaller pilot, but I'm hesitant to go smaller to get the idle better, and end up making it harder to start. Nice thing about jetting is, you can always change it back. :)

I notice in the '81 specs it lists the 430 with an R-4 and the 420s with R-2 needle jets. I'd bet money the '82 Q-8 is a misprint or as has been mentioned, for a restricted street going model in Europe.
 
You must log in or register to reply here.
Back
Top